Chair back



FIG. 1 is a perspective view of a first embodiment of a chair back according to the present invention;

FIG. 2 is a side-elevational view of the chair back of FIG. 1, the other side being a mirror image thereof;

FIG. 3 is a front elevational view of the chair back of FIGS. 1 and 2;

FIG. 4 is a rear elevational view of the chair back of FIGS. 1-3;

FIG. 5 is a perspective view of a second embodiment of a chair back according to the present invention;

FIG. 6 is a side-elevational view of the chair back of FIG. 5, the opposite side being a mirror image thereof;

FIG. 7 is a front elevational view of the chair back of FIGS. 5 and 6; and,

FIG. 8 is a rear elevational view of the chair back of FIGS. 5-7.

The broken lines shown in FIGS. 1-8 are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a chair back, as shown and described. 